'use strict';

const fs = require('fs');
const path = require('path');
const paths = require('./paths');

// Make sure that including paths.js after env.js will read .env variables.
delete require.cache[require.resolve('./paths')];

const NODE_ENV = process.env.NODE_ENV;

const API_HOST = process.env.API_HOST ? process.env.API_HOST : 'http://localhost:8080';
const ENV_BASE_PATH = `${process.env.BASE_PATH}`.trim();
const BASE_PATH = ENV_BASE_PATH.length === 0 ? '/' : ENV_BASE_PATH;

const APP_NAME = process.env.APP_NAME ? process.env.APP_NAME : 'hzero-front';
const WEBSOCKET_HOST = process.env.WEBSOCKET_HOST || 'ws://192.168.16.173:8120';
const CLIENT_ID = process.env.CLIENT_ID ? process.env.CLIENT_ID : 'localhost';
const AUTH_HOST = `${API_HOST}/oauth`;
const PLATFORM_VERSION = process.env.PLATFORM_VERSION || 'SAAS';
const LOGOUT_URL = process.env.LOGOUT_URL || '';
const LOGIN_URL = process.env.LOGIN_URL || '';
const IM_ENABLE = process.env.IM_ENABLE || 'true';
const IM_WEBSOCKET_HOST = process.env.IM_WEBSOCKET_HOST || 'ws://192.168.16.173:9876';
const CUSTOMIZE_ICON_NAME = process.env.CUSTOMIZE_ICON_NAME || 'customize-icon';

if (!NODE_ENV) {
  throw new Error(
    'The NODE_ENV environment variable is required but was not specified.'
  );
}

// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
var dotenvFiles = [
  `${paths.dotenv}.${NODE_ENV}.local`,
  `${paths.dotenv}.${NODE_ENV}`,
  // Don't include `.env.local` for `test` environment
  // since normally you expect tests to produce the same
  // results for everyone
  NODE_ENV !== 'test' && `${paths.dotenv}.local`,
  paths.dotenv,
].filter(Boolean);

// Load environment variables from .env* files. Suppress warnings using silent
// if this file is missing. dotenv will never modify any environment variables
// that have already been set.  Variable expansion is supported in .env files.
// https://github.com/motdotla/dotenv
// https://github.com/motdotla/dotenv-expand
dotenvFiles.forEach(dotenvFile => {
  if (fs.existsSync(dotenvFile)) {
    require('dotenv-expand')(
      require('dotenv').config({
        path: dotenvFile,
      })
    );
  }
});

// We support resolving modules according to `NODE_PATH`.
// This lets you use absolute paths in imports inside large monorepos:
// https://github.com/facebook/create-react-app/issues/253.
// It works similar to `NODE_PATH` in Node itself:
// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
// Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
// https://github.com/facebook/create-react-app/issues/1023#issuecomment-265344421
// We also resolve them to make sure all tools using them work consistently.
const appDirectory = fs.realpathSync(process.cwd());
process.env.NODE_PATH = (process.env.NODE_PATH || '')
  .split(path.delimiter)
  .filter(folder => folder && !path.isAbsolute(folder))
  .map(folder => path.resolve(appDirectory, folder))
  .join(path.delimiter);

// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
// injected into the application via DefinePlugin in Webpack configuration.
const REACT_APP = /^REACT_APP_/i;

function getClientEnvironment(publicUrl) {
  const raw = Object.keys(process.env)
    .filter(key => REACT_APP.test(key))
    .reduce(
      (env, key) => {
        env[key] = process.env[key];
        return env;
      },
      {
        // Useful for determining whether we’re running in production mode.
        // Most importantly, it switches React into the correct mode.
        NODE_ENV: process.env.NODE_ENV || 'development',
        // Useful for resolving the correct path to static assets in `public`.
        // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.
        // This should only be used as an escape hatch. Normally you would put
        // images into the `src` and `import` them in code to get their paths.
        PUBLIC_URL: publicUrl,

        BASE_PATH,
        API_HOST,
        APP_NAME,
        WEBSOCKET_HOST,
        CLIENT_ID,
        AUTH_HOST,
        PLATFORM_VERSION,
        // LOGIN_URL/LOGOUT_URL 登陆认证/登出地址, 如果不需要改就不用改, 默认取 AUTH_HOST, AUTH_HOST 取 API_HOST/oauth
        LOGIN_URL,
        LOGOUT_URL,
        IM_ENABLE,
        IM_WEBSOCKET_HOST,
        CUSTOMIZE_ICON_NAME,

        // SERVICE CONFIG
        // 对应的服务
        routeMap: process.env.routeMap,

        // 额外的网关服务前缀
        HDGP_DIM: '/ddim',
        HDGP_DGM: '/ddgm',
        HDGP_MDM: '/dmdm',
        HDGP_DAM: '/ddam',
        HDGP_DMM: '/ddmm',
      }
    );
  // Stringify all values so we can feed into Webpack DefinePlugin
  const stringified = {
    'process.env': Object.keys(raw).reduce((env, key) => {
      env[key] = JSON.stringify(raw[key]);
      return env;
    }, {}),
  };

  return {raw, stringified};
}

module.exports = getClientEnvironment;
